Rotary-shaft lock



Jan. 22,1 1929;-

R. R. HAUPT. JR, ET AL ROTARY SHAFT LOCK Filed July 11, 1927 I INVENT 3156716011112: J

@ E1461 Fer E H a u vf ATTORNEYS 2 Sheets-Sheet 1 Jan. 22, 1929.

R. R. HAUPT. JR.. ET AL ROTARY SHAFT LOCK 2 Sheets-Sheet 2 Filed July 11. 1927 INVENTOR Richardffaupl Jr ATTORNEYS Patented Jan. 22, 1929.

UNITED STATES PATENT OFFICE.

RICHARD R. HAUIT, JR, AND WALTER F. HAUPT, OF HILLSIDE, NEW JERSEYL ROTARY-SHAFT LOCK.

Application filed July 11, 1927. Serial No. 204,907.

This invention relates to rotary shaft looking devices, and has particular reference to a means for locking a rotary shaft againstrotation except by movement of a driving memher which produces a torque on said shaft.

The invention while not exclusively designed for such use, is admirably suited for use in connection with dumb-waiter operating means, and for the purpose of illustration will be described as applied to this use.

It has been observed that an overloaded dumb-waiter will descend at such a rapid rate of speed that serious results follow, and the present invention comprehends a means for locking against rotation the shaft of the pulley r sheave over which the dumb-waiter supporting cable is trained, except when the manipulating rope is manually operated to turn said shaft. I

The invention furthermore comprehends in combination with a shaft and a driving member for producing a torque on said shaft, a means for locking the shaft against rotation except by movement of the driving membertherewith to exert a torque thereon.

More specifically the invention comprehends in combination with a shaft and a driving member for producing a torque on said shaft, a means for lo'ckingthe shaft against rotation and a means operable by relative movement of the driving member with respect to the shaft for releasing said locking means so as to prevent rotationof the shaft except upon movement of the same by and with said driving means.

Other objects reside in the simplicity of construction and mode of operation of the devicef the economy with which the same may be produced and installed and the general efficiency derived therefrom.

\V'i'th the above recited and other objects in view, reference is had to the following description and accompanying drawings in which there is exhibited one example or embodiment ofthe invention, while theappended claims define the actual scope of the invention.

In the draWings- Figure 1 is a longitudinal sectional view illustrating the shaft locking means as parti'cula-rly applied to a dumbwvaiter operating mechanism; I

Fig. 2 is a sectional view therethrough taken approximately 011 the line indicated at 2 2 in Fig. 1; I

Fig. 3 is a sectional view taken approximately on the line indicated at 3-3 in Fig. 1;

Fig. 4 is a similar view taken approximately on the line ll of Fig. 1';

Fig. 5 is a similar view taken approxi: mately on the line 55 of Fig. 1.

Referring to the drawings by characters of reference, designates a rotary shaft, which is journaled in bearings 1l-11 carried by a. suitable support 12. As heretofore stated, the device for the purpose of illustration will be described as applied to a dumb-waiter operating mechanism, in which 13 is the pulley or sheave around Which the supporting cable or rope (not shown) is trained, the opposite ends being respectively attached to the dumb-waiter and to a counterbalance weight. The sheave or pulley 14 around which the operating rope (not shown) for turning the shaft is trained, is, in the present instance, secured to the shaft 10 in such a manner as to permit of a limited relative rotatory movement. This means consists in providing the. hub 15' of the pulley or sheave 1 f witha cut-away or notched portion 16 and providing the shaft 10 with a radially projecting pin 17 which while permitting limited 'or slight rotatory movement, keys the sheave 14 to the shaft for rotation therewith. The locking means comprises a cam 18 which is rigidly secured -to the shaft and which isof generally circular formation having cutaway portions defining cam faces l9'and 20 disposed at a tangent to the periphery of theshaft 10. The cam 18 is arranged within a casing covering or bearing member 21, which has-a circular opening 22 extending therethrough concentric to the shaft axis and the outer periphery of the cam 18 softhat the cam faces 19 and 20 together with tile face or wall of the opening 22, define spaces of gradually reducing widths from the medial portions to the outer ends of said spaces. Jam rollers 24 extend through the spaces 23,

the am rollers "being of a diameterslightly less than the medial width of the spaces 23. The jam rollers are of a length to have extremities extending beyond the opposite sides of the member 21 and said extremities are journaled respectively in plates or disks which are disposed alongside of the member 21 on opposite sides thereof. The plates or disks 25 and 26 are provided with concentric openings2'7 and 28 respectively to accommodate 'the'shaft lOwhich obviously extends axiallythrough the member 21. The plates or disks 25 and 26 are formed with radial circumferentially spaced notches29 and 30 in which the projecting extremities of the am rollers are journaled and raidally movable. The plate or disk 25 is further provided with an arcuate slot 31 while the hub 15 of the sheave 14 is provided with an axially projecting pin 32 extending into the arcuate slot 31.

Under this construction and arrangement, it is obvious that turning movement of the sheave or pulley 14 in either direction will initially bring the pin 17 into engagement with one or the other end wall of the notch or cut-away portion 16 to turn the shaft 10 and slieaves 1&3 therewitl ihh the end of the notch or cut-away portion 16 comes into engagement with the pin 17, the pin 32 likewise engages with the end of the arcuate slot 31 in the plate 25. The pin 32 is so positioned that its engagement with either end of the slot 31, disposes the jam rollers 25 in an intermediate release position so that the shaft 10 is free to move. If as in the case of a dumb-waiter, the weight is excessive and the pulley or sheave 13 attempts to turn faster than the sheave or pulley 14, the motion of the shaft exceeding the turning motion of the plate or disk 25, causes the jam rollers 24 to wedge between the cam faces 19 and 20 of the cam 18 and the inner periphery of the member 21, thereby locking the shaft until the turning movement of the shaft 14 through the pin-andslot connection, again disposes the jam rollers in their intermediate, neutral, or released position.

In order to render the jamming and locking action of the jam rollers more immediately effective, a suitable tension means may be employed, such as a split brake band 33 which surrounds the plate or disk 25, one terminal 341 of the brake band being rigidly attached to a suitable support and the opposite terminal 35 being normally moved to contract the band by means of a spring 36, the tension of which is adjustable in any well-known manner.

From the foregoing it'will thus be seen that a shaft locking device has been devised which prevents rotation of the shaft except by movement of a driving member, which produces a torque on said shaft, and while the device has been particularly described and illustrated for dumb-waiter operating meehanisn'l it is to be understood that the same is subject to other uses to which it may be put. i

What is claimed is:

1. In combination, a shaft and a driving member for producing a torque on said shaft, said driving member being secured to the shaft for limited relative rotatory motion, of means for locking the shaft against rotation, comprising a cam member secured to the shaft, a bearing having an inner circular face within which the cam member is arranged and through which the shaft axially extends, said cam member having faces disposed at a ,voopao tangent to the inner circular face of the bearing, jam rollers interposed between the cam faces and the circular inner face of the bearing, and means operable by relative rotatory movement of the driving member with respect to the shaft, for holding the effective jam roller inactive for releasing said locking means whereby to prevent rotation of the shaft except by and with the driving member.

2. The combination with a shaft having a driven pulley keyed thereto for rotation therewith and a driving pulley secured to the shaft for limited relative rotatory movement, of shaft locking means operable by relative rotatory movement of the driving pulley with respect to the shaft for releasing said locking means whereby the shaft is held against rotation except by means of the driving pulley, said means comprising a cam member secured to the shaft, a bearing having an inner circular face within which the cam mem her is arranged and through which the shaft axially extends, said cam member having faces disposed at opposite tangents to the inner circular face of the bearing, jam rollers interposed between said cam faces and the circular inner face of the bearing and means operable by relative rotatory movement of the d 'ive pulley with respect to its shaft for holding the effective jam roller inoperative for the purpose specified.

3. The combination with a shaft having a driven pulley keyed thereto for rotation therewith and a driving pulley secured to the shaft for limited relative rotary movement, of shaft locking means operable by relative rotatory movement of the driving pulley with respect to the shaft for releasing said locking means whereby the shaft is held against rotation except by means of the driving pul ley, said means comprising a cam member secured to the shaft, a bearing having an inner circular face within which the cam memher is arranged and through which the shaft axially extends, said cam member having faces disposed at a tangent to the inner circular face of the bearing, jam rollers interposed between the cam faces and the circular inner face of the bearing, a plate alongside of the cam member within which the jam rollers are journaled and radially movable, said plate having a concentric arcuate slot, and a pin on the driving pulley engageable in said slot and operable upon turning movement of the driving pulley to engage with either end of said slot to hold the jam rollers in an intermediate release position.

4;. The combination with a shaft having a driven pulley keyed thereto for rotation therewith and a driving pulley secured to the shaft for limited relative rotatory movement, of shaft locking means operable by relative rotatory movement of the driving pulley with respect to the shaft for releasing said locking means whereby the shaft is held against rotation except by means of the driving pulley, said means comprising a cam member secured to the shaft, a bearing having an inner circular face Within which the cam member is ar ranged and through which the shaft axially extends, said cam member having faces disposed at a tangent to the inner circular face of the bearing, jam rollers interposed between the cam faces and the circular inner face of the bearing, a plate alongside of the cam member within which the jam rollers are journaled and radially movable, said plate having a concentric arcuate slot and operable upon turning movement of the driving slot, a pin on the driving pulley engageable in said slot to engage with either end of said slot to hold the jam rollers in an intermediate release position, and means engageable with said plate for producing a light tension thereon to render the locking action of the jamb rollers instantaneously effective.

5. The combination With a shaft having a driven pulley keyed thereto for rotation therewith and a driving pulley secured to the shaft for limited relative rotatory movement, of shaft locking means operable by relative rotatory movement of the drive pulley with respect to the shaft for releasing said locking means whereby the shaft is held against rotation except by means of the driving pulley, said means comprising a cam member secured to the shaft, a bearing having an inner circular face Within Which the cam member is arranged and through which the shaft axially extends, said cam member having faces disposed at opposite tangents to the in ner circular face of the bearing, jam rollers interposed between said cam faces and the circular inner face of the bearing, a plate alongside 0f the cam member in which the jam rollers are journaled and radially movable and means operable by a relative rotatory moven'ient of the drive pulley with respect to the shaft for turning the plate to hold the effective jam roller inactive for the pur pose specified.

RICHARD H. HAUPT, JR. WVALTER F. HAUPT. 

